But I made mine like this - based on rectangles rather than squares.
The image is ATC sized so my card is quite small.

I started with a rectangle 5 inches across by 6.5 inches long. I scored across at 3 inches up and cut down the middle of the upper rectangle making two rectangles 2.5 by 3.5 inches.
I scored the diagonals of these to fold down two triangles.
I made 3.5 inch squares to attach to these triangles.

By now you have seen the embellishments - each piece was matted with paper from my stash.
The image was coloured with Promarkers and distressed with antique linen.
I then added some 'gardening'stickers which have been in my drawer for years - originally from Kinokuniya - a huge bookshop in Dubai.